62 lines
2 KiB
ObjectPascal
62 lines
2 KiB
ObjectPascal
// The FPC (FreePascal compiler) discards the program header
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// (except in ISO-compliant “compiler modes”).
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program showAsciiTable(output);
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const
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columnsTotal = 6;
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type
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// The hash indicates a char-data type.
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asciiCharacter = #32..#127;
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asciiCharacters = set of asciiCharacter;
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var
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character: asciiCharacter;
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characters: asciiCharacters;
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column, line: integer;
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begin
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// characters needs to be initialized,
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// because the next `include` below
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// will _read_ the value `characters`.
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// Reading _unintialized_ values, however,
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// is considered bad practice in Pascal.
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characters := [];
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// `div` denotes integer division in Pascal,
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// that means the result will be an _integer_-value.
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line := (ord(high(asciiCharacter)) - ord(low(asciiCharacter)))
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div columnsTotal + 1;
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// Note: In Pascal for-loop limits are _inclusive_.
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for column := 0 to columnsTotal do
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begin
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// This is equivalent to
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// characters := characters + […];
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// i.e. the union of two sets.
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include(characters, chr(ord(low(asciiCharacter)) + column * line));
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end;
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for line := line downto 1 do
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begin
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// the for..in..do statement is an Extended Pascal extension
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for character in characters do
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begin
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// `:6` specifies minimum width of argument
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// [only works for write/writeLn/writeStr]
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write(ord(character):6, ' : ', character);
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end;
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// emit proper newline character on `output`
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writeLn;
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// `characters` is evaluated prior entering the loop,
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// not every time an iteration finished.
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for character in characters do
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begin
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// These statements are equivalent to
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// characters := characters + [character];
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// characters := characters - [succ(character)];
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// respectively, but shorter to write,
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// i.e. less susceptible to spelling mistakes.
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exclude(characters, character);
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include(characters, succ(character));
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end;
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end;
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end.
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